45°倾斜岩层巷道围岩变形破坏的FLAC3D数值模拟研究

深部倾斜岩层巷道大变形事故频发，为研究45°倾斜岩层巷道围岩变形破坏特征和作用机理，采用FLAC3D数值模拟方法研究45°倾斜岩层巷道围岩变形和破坏过程，得到该类型巷道围岩位移场、应力场和塑性区分布特征云图，数值模拟分析得到的巷道变形趋势与工程现场结果一致。研究得出：巷道变形过程中会引起一定范围的岩层滑动；巷道附近岩层法向变形不协调导致巷道周围岩层弯剪破坏，破坏后形成的机动结构体系是巷道变形和失稳的直接原因。根据围岩的变形和应力分布特征对巷道进行合理开挖和有效支护，可为类似工程的巷道支护提供可靠参考依据。

FLAC3D Numerical Simulation Study on Deformation and Failure of Surrounding Rock of Roadway in 45 Degree Inclined Strata

Large deformation accidents occur frequently in deep inclined strata roadways.In order to study the deformation and failure characteristics and mechanism of surrounding rock in 45 degree inclined strata,FLAC3D numerical simulation method is used to study the deformation and failure process of the surrounding rock in the 45-degree inclined strata.Distribution characteristics of displacement field,stress field and plastic zone of surrounding rock in this type of roadway are obtained.The obtained roadway deformation trend is consistent with the project site results.It is concluded that the deformation of the roadway will cause a certain range of rock stratum sliding; the unconformity of the normal deformation of the rock stratum near the roadway will lead to the bending and shearing of the rock stratum.The subsequent formation of the mobile structure is the direct cause of roadway deformation and instability.Through this study,the deformation and failure law of surrounding rock in inclined rock stratum roadway is obtained,which can provide reference for roadway support of similar projects.